What effect does sodium silicate have on bauxite flotation?
Sodium silicate types adversely billed silicic acid colloidal fragments and equivalent hydrolyzed parts with hydrolysis and polymerization in liquid remedy. Considering that they have the exact same acid radicals as silicate minerals, they are easier to adsorb externally of silicon-containing minerals, and the adsorption is relatively strong. On the one hand, due to the strong hydrophilicity of the silicic acid part, it improves the repressive effect on minerals; on the other hand, as a result of its adsorption, the minerals have a greater unfavorable potential, which improves the repulsive force in between minerals and boosts the silicon content. The diffusion of minerals influences the floatability of minerals, and because the adverse cost of minerals is improved, the adsorption of anionic collectors is deteriorated, or the adsorption of cationic collectors is improved, thus triggering restraint or activation. For that reason, the above two elements figure out whether salt silicate activates or prevents minerals.
In the dodecyl amine flotation protection system, salt silicate has little result on the flowability of diaspore; sodium silicate can somewhat activate the flotation protection of kaolinite and pyrophyllite under acidic problems, while in antacids Under acidic problems, it prevents the flotation protection of kaolinite and pyrophyllite; for illite, salt silicate plays a repressive function, and only shows a minor activation result under really solid acidic problems. Sodium silicate is quickly adsorbed externally of silicon-containing minerals to decrease their adverse charge. The acidic conditions contribute to the cationization of the dodecylamine collector and enhance the electrostatic communication between the enthusiast and silicate minerals, thus turning on the silicate minerals flotation. Under alkaline problems, because of the decrease of dodecylamine ions, the electrostatic communication is weakened, and the adsorption of the collection agency is minimized. At the exact same time, the strong hydrophilicity of sodium silicate hinders the flotation protection of silicate minerals.
In the quaternary ammonium salt DTAL enthusiast system, sodium silicate activates the flotation protection of diaspore and kaolinite. Near the neutral pH value, the activation impact of salt silicate on diaspore and kaolinite weakens., the flotation protection healing price reaches a nadir; for the flotation of illite and pyrophyllite, salt silicate shows a minor repressive impact. The local ions on the mineral surface area are H+ and OH-. Under acidic problems, the mineral surface area is positively charged through protonation, and silicate anions are quickly adsorbed; under alkaline problems, silicate anions are quickly adsorbed on the mineral surface with oxygenation, and Under neutral conditions, mineral surface area websites mainly exist in the type of hydroxyl groups on the mineral surface area, which is not for the adsorption of silicate ions. The quaternary ammonium salt is completely ionized in the liquid solution and engages with the mineral surface area via electrostatic communication. The greater the adverse charge, the more powerful the electrostatic communication and the easier it is for the enthusiast to adsorb. As a result, under acidic or alkaline conditions, salt silicate is more likely to turn on the flotation of kaolinite and diaspore, while under neutral conditions, the activation impact of sodium silicate is reduced. As for illite and pyrophyllite, the (001) airplane and the (001) airplane in their crystal structures are both silicon-oxygen tetrahedral layers. Because they have the same anions as silicate radicals, silicate radicals can conveniently develop in illite and pyrophyllite. Strong adsorption takes place on the stone surface, and the hydrophilicity of silicate ions dominates; that is, the repressive result is greater than the activation effect. As a result, salt silicate shows a slight inhibitory impact in the flotation protection of illite and pyrophyllite.
Salt silicate reduces the positive capacity of each single mineral surface under acidic conditions. It minimizes the absolute value of the Zeta potential of diaspore, illite, and pyrophyllite under alkaline problems, while the Zeta capacity of kaolinite. It even more lowers as the pH value boosts. Under acidic conditions, salt silicate adsorbs silicate anions on the mineral surface, lowering the positive potential of the mineral surface; while under alkaline problems, because of the adsorption cover of silicate ions on the mineral surface and the oxygen condensation polymerization of silicate ions, consequently reducing the hydroxyl websites on the mineral surface area. As the pH value rises, the negative capacity on the mineral surface area lowers.
As a result, under acidic problems, salt silicate reduces the electropositivity of the mineral surface, thereby lowering the repulsive effect of the mineral surface on the cationic collection agency and enhancing the adsorption of the collector on the mineral surface area. Because the degree of cationization of dodecyl amine is connected to the pH worth, compared to the totally cationized quaternary ammonium salt DTAL, the electrostatic impact of the mineral surface on dodecyl amine is weaker than the electrostatic impact on DTAL. As a result, the activation effect of salt silicate on minerals in the DTAL system is stronger than that in the dodecylamine system.
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